<!DOCTYPE html>
<html>
<head>
	<title></title>
	<meta charset="utf-8">
	<style type="text/css">
		span{
			display:block;
			width: 15px;
			height:25px;
			background: url(img/jd.png) -126px -360px;
			margin:100px auto;
			transition:all 1s;
		}
		span:hover{
			background-position: -126px -397px;
		}
	</style>
</head>
<body>
	<span></span>
</body>
</html